Wednesday, 13 October 2004 - 1:25 PM

This presentation is part of : Micro- and Nano-scale Materials Characterization I

Influence of the temperature on the interface mechanical properties of a Ti/SiC composite

Carlos González, Javier LLorca, and Oscar García. Polytechnic University of Madrid, Department of Materials Science, E. T. S. de Ingenieros de Caminos, madrid, 28040, Spain

Interface properties play a key role in the mechanical behavior of composites and they are controlled by intrinsic factors and extrinsic factors, such as the temperature. While fiber push-out tests at ambient temperature provide the interface properties in any composite system, data on the effect of temperature are scarce, mainly due to the experimental difficulties associated to carry out push-out tests at elevated temperature. This problem was addressed in the investigation in a a Ti-6Al-4V alloy uniaxially reinforced with 35 vol. % of SiC Sigma 1140+ fibers. Push-out and re-push tests were carried out on thin composite slices from room temperature up to 400ºC. The load was applied using cylindrical WC punches of 80 mm of diameter while the displacement of the load point was measured with a LVDT. The test results were interpreted to obtain the interface properties with the help of a numerical simulation of the push-out test using the finite element method, which includes the effect of the thermal residual stresses that arise in fiber and matrix from the consolidation temperature. The interface was modeled with interface cohesive elements that transmits normal and shear stresses according to a cohesive law. As a result of the tests and numerical simulations, the evolution of the friction coefficient and of the interface sliding resistance with temperature was obtained.

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